Centene interview questions

Comminicated with talent acquisition via email. Actual interview very quick and laid back. She only asked four questions, all revolved around policy. Half of the interview was her talking about the position itself.

You get to interview with the hiring supervisor its about 30 minutes to 45 min. Received offer but after background cleared I was told position closed no further explanation. I was just told keep applying to other positions but you see same position posted.